Fix Sprite destructor error when not fully constructed.
Fix Sprite destructor error when not fully constructed.

mpasternak/pyglet-fix-issue-518-522,xshotD/pyglet,mpasternak/michaldtz-fix-552,xshotD/pyglet,Alwnikrotikz/pyglet,qbektrix/pyglet,arifgursel/pyglet,odyaka341/pyglet,odyaka341/pyglet,gdkar/pyglet,odyaka341/pyglet,Austin503/pyglet,google-code-export/pyglet,mpasternak/pyglet-fix-issue-518-522,mpasternak/michaldtz-fix-552,mpasternak/michaldtz-fixes-518-522,Austin503/pyglet,Alwnikrotikz/pyglet,Alwnikrotikz/pyglet,shaileshgoogler/pyglet,mpasternak/pyglet-fix-issue-552,arifgursel/pyglet,qbektrix/pyglet,gdkar/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-518-522,xshotD/pyglet,shaileshgoogler/pyglet,Alwnikrotikz/pyglet,Austin503/pyglet,cledio66/pyglet,kmonsoor/pyglet,mpasternak/pyglet-fix-issue-552,kmonsoor/pyglet,mpasternak/michaldtz-fix-552,Austin503/pyglet,cledio66/pyglet,cledio66/pyglet,xshotD/pyglet,mpasternak/pyglet-fix-issue-552,arifgursel/pyglet,mpasternak/michaldtz-fixes-518-522,mpasternak/michaldtz-fixes-518-522,cledio66/pyglet,Alwnikrotikz/pyglet,odyaka341/pyglet,gdkar/pyglet,shaileshgoogler/pyglet,shaileshgoogler/pyglet,mpasternak/michaldtz-fix-552,google-code-export/pyglet,gdkar/pyglet,kmonsoor/pyglet,mpasternak/pyglet-fix-issue-518-522,qbektrix/pyglet,xshotD/pyglet,google-code-export/pyglet,kmonsoor/pyglet,google-code-export/pyglet,qbektrix/pyglet,google-code-export/pyglet,cledio66/pyglet,mpasternak/michaldtz-fixes-518-522,gdkar/pyglet,mpasternak/pyglet-fix-issue-552,odyaka341/pyglet,shaileshgoogler/pyglet,kmonsoor/pyglet,arifgursel/pyglet,arifgursel/pyglet,qbektrix/pyglet